/*
 * Copyright 2011 Clean GWT
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.cleangwt.user.shared;

import java.util.List;

import com.cleangwt.json.client.BooleanDeserializer;
import com.cleangwt.json.client.CollectionDeserializer;
import com.cleangwt.json.client.JsonValueDeserializer;
import com.cleangwt.json.client.StringDeserializer;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONValue;

/**
 * The {@link Link} json deserializer.
 * 
 * @author Jess
 * @version 1.0
 * @since 1.0
 */
public class LinkDeserializer extends JsonValueDeserializer<Link> {

  private static LinkDeserializer impl;

  /**
   * @return the instance of {@link Link} deserializer
   */
  public static LinkDeserializer get() {
    if (impl == null) {
      impl = new LinkDeserializer();
    }
    return impl;
  }

  private LinkDeserializer() {
  }

  @Override
  public Link fromJson(JSONValue jsonValue) {
    if (jsonValue == null || jsonValue.isNull() != null) {
      return null;
    }
    JSONObject object = (JSONObject) jsonValue;
    String name = StringDeserializer.get().fromJson(object.get("name"));
    String value = StringDeserializer.get().fromJson(object.get("value"));
    Boolean disabled = BooleanDeserializer.get().fromJson(object.get("disabled"));
    List<Link> subLinks =
        (List<Link>) CollectionDeserializer.get(LinkDeserializer.get()).fromJson(
            object.get("subLinks"));

    Link link = new Link(name, value, disabled);
    link.setSubLinks(subLinks);
    return link;
  }
}
